The death toll from the atrocities in the Catalan capital and later in the town of Cambrils has risen to 14, with "a number" of Britons believed to be among the 130 people injured.

People stand next to flowers, candles, a poster reading 'Pray for Barcelona' (Image: AFP or licensors)

Speaking from her country residence Chequers, the Prime Minister said: "The UK stands shoulder to shoulder with Spain in confronting and dealing with the evil of terrorism, and I have offered any assistance we can provide.

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"Sadly I must tell you that we do believe that a number of British nationals were caught up in the attack and we are urgently looking into reports of a child believed missing, who is a British dual national."